Saint Lucia Weather in September
During September, Saint Lucia experiences very high daytime temperatures of 31°C (88°F) and cooler nights around 26°C (79°F). Expect quite a bit of rainfall. Around 126 mm (5 in) is typical.
Rainfall in Saint Lucia in September
Climate statistics over the past 30 years suggest around 24 days of rain, with 126 mm (5 in) average for the month. Wet weather is a regular and significant part of this month. Frequent days of rain combined with high totals means proper waterproofs are worth packing.
Temperature in Saint Lucia in September
In September, expect very high temperatures in Saint Lucia, with highs of 31°C (88°F) and lows of 26°C (79°F) at night. Mornings and evenings are often more comfortable than the peak afternoon hours. Nights stay warm at around 26°C (79°F), so light bedding and good ventilation are worth thinking about.
Sunshine in Saint Lucia in September
Enjoy a sunny month with about 238 hours of sunshine, the clear skies make Saint Lucia even more beautiful.If you prefer dry days with pleasant temperatures, September may not be the ideal month to visit Saint Lucia. Our weather planner can help you explore destinations with more pleasant weather conditions.
Check the conditions for any month of the year.
For a detailed overview over the year and the best time to visit Saint Lucia, check out our Saint Lucia's climate page.
Saint Lucia Temperature in September
Min Temperature
26°C (79°F)
Max Temperature
31°C (88°F)
Chance of Rain
81%
Precipitation
126 mm (5 in)
Rainy days
24 days
Humidity
81%
Sunshine
238 hours
Percentage Sunshine
Daily Historical Temperatures
49-year average (1976-2025)
Based on our historical records, temperatures in Saint Lucia typically stay consistent throughout September, with daily highs averaging around 31°C (88°F). Nights are warm, with lows around 25°C (77°F).
Average temperatures in September
Historical weather for Saint Lucia in September
Browse day-by-day weather records for Saint Lucia spanning 51 years. Select any month and year to see actual temperatures, rainfall, and conditions recorded on each day.
Saint Lucia historical weather extremes in September
Based on 35 years of weather observations in Saint Lucia between 1990 and 2025, these are the recorded extremes.
- The warmest day in September was on September 3, 2003, with a maximum of 34°C (93°F).
- The coldest September day was on September 18, 2008, with a maximum of 26°C (79°F).
- Saint Lucia registered its coldest September night on September 11, 2011, with temperatures dropping to 18°C (64°F).
Best Places in Saint Lucia in September
Find out more about the weather in Saint Lucia and which places have the best travel conditions in this month. See all of Saint Lucia in September →
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What to Wear in Saint Lucia in September
Warm weather calls for comfortable, breathable clothing in September. Cotton t-shirts, shorts, light dresses, and sandals are perfect. You might still want a light layer for evenings or air-conditioned places (for example buses). High rain levels are expected, so pack waterproof gear and an umbrella or poncho. You'll definitely want to pack sunglasses and sunscreen. There will be plenty of bright sunshine this month.What To Do in Saint Lucia in September
We rated the following activities from 1 (least suitable) to 10 (best) to do.
Check the conditions for any month of the year.
For a detailed overview over the year and the best time to visit Saint Lucia, check out our Saint Lucia's climate page.
Temperature Rainfall Sunshine Humidity
See the full Saint Lucia climate overview or explore weather in Saint Lucia.
